Chains and heterogens:
PDB Chain Sequences:
>1b1yA (A:) mkgnyvqvyvmlpldavsvnnrfekgdelraqlrklveagvdgvmvdvwwglvegkgpka ydwsaykqlfelvqkaglklqaimsfhqcggnvgdavnipipqwvrdvgtrdpdifytdg hgtrnieyltlgvdnqplfhgrsavqmyadymtsfrenmkdfldagvivdievglgpage lrypsypqshgwsfpgigeficydkylqadfkaaaaavghpewefpndagqyndtpertq ffrdngtylsekgrfflawysnnlikhgdrildeankvflgykvqlaikiagvhwwykvp shaaeltagyynlhdrdgyrtiarmlkrhrasinftcaemrdseqppdamsapeelvqqv lsagwreglnvscenalprydptayntilrnarphginqsgppehklfgftylrlsnqlv egqnyvnfktfvdrmhanlprdpyvdpmaplprsgpeisiemilqaaqpkiqpfpfqeht dlpvgptggmggqaegptcg